Transfer zone from Windows DNS

[Andrea]

Hi there,
I'm setting up a secondary dns server with bind (the primary is a
Microsoft DNS server).
First of all I was wondering if I have to write this

zone "xxx.it" {
        type slave;
        file "/var/slaves/xxx.it.zone";
        masters { xxx.xxx.xxx.xxx; };
        allow-transfer { xxx.xxx.xxx.xxx; };
};

for every domain bind have to be the slave or is there a way/script
where I tell bind the list of the domains and it does it all

domain1.com
domain2.com
...
...
domainx.com

Second question: if on the master is added a new domain, is there a
way that bind automatically add this to its list or do I have to add
it manually every time?
Thanks,
Andrea